archivers/zip-ada: Update to 55.

[rigoletto]

Summary

• Update to 55
• switch to DISTVERSION
• add LICENSE_FILE[1]

[1] the file does not only contain the license but also code. Can it be used/pointed as LICENSE_FILE?

[rigoletto]

LICENSE_FILES ---> LICENSE_FILE

[tcberner]

archivers/zip-ada/Makefile

14 ↗

(On Diff #54014)

^ grepping the LICENSE_FILE entries in the tree I did not spot any other source code files (well, I did not look too closely, so might not hold up in court :D ) -- but I'd say, just get rid of the line :).

[rigoletto]

Remove LICENSE_FILE.